shrinksafe.dojotoolkit.org has a form to upload a js file and run shrinksafe on it. Form response for my file is a blank page in both Firefox and IE. Same js file compresses fine using custom_rhino.jar on my machine.
The js file is available at http://www.mattkruse.com/javascript/calendarpopup/combined/CalendarPopup...

lynx either
Tried in lynx as well, same result. Lynx tells me the response is an application/x-gzip object, but it's empty.
With the changes in infrastructure...
...some of the internal path references have been broken. We're working on it, please be patient.